CN113652604A - Preparation method of high-hardenability hot-rolled round steel for engineering machinery - Google Patents
Preparation method of high-hardenability hot-rolled round steel for engineering machinery Download PDFInfo
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- CN113652604A CN113652604A CN202110775839.2A CN202110775839A CN113652604A CN 113652604 A CN113652604 A CN 113652604A CN 202110775839 A CN202110775839 A CN 202110775839A CN 113652604 A CN113652604 A CN 113652604A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a preparation method of high-hardenability hot-rolled round steel for engineering machinery, which comprises the following steel-making processes: desulfurized molten iron, converter, external refining, VD vacuum treatment, continuous casting and slow cooling of a slow cooling pit; the steel rolling process comprises the following steps: heating a casting blank, removing phosphorus by high-pressure water, carrying out phi 850 cogging mill, carrying out phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit rolling, sawing, annealing pit annealing, checking, polishing, bundling, warehousing and delivering; wherein: the initial rolling temperature is less than or equal to 1050 ℃; the finishing temperature is less than or equal to 850 ℃; the temperature of the entering slow cooling pit is more than or equal to 450 ℃; the temperature of the slow cooling pit is less than or equal to 150 ℃; the heat treatment process comprises the following steps: normalizing at a temperature of 910 ℃; the quenching temperature is 895 ℃. The yield strength, tensile strength, elongation and hardenability of the steel product prepared by the method all meet the performance requirements.
Description
Technical Field
The invention relates to the field of material metallurgy, in particular to a preparation method of high-hardenability hot-rolled round steel for engineering machinery.
Background
With the development of engineering machinery manufacturing technology, equipment is developed to be large-sized and large-tonnage, and new requirements are provided for the use conditions of materials. Because the engineering mechanical equipment has harsh use conditions and requires the engineering mechanical parts to have excellent comprehensive mechanical properties and high hardenability, a low-cost low-alloying high-hardenability hot rolled steel is developed on the basis of the conventional steel production technology, and the low-cost low-alloying high-hardenability hot rolled steel has important significance on the service life, the durability and the safety of the engineering mechanical equipment.
The patent CNIO 8866431A relates to a steel for high hardenability of engineering machinery and a controlled rolling and controlled cooling preparation method thereof, and the production process is complex by adopting a controlled rolling and controlled cooling process, so that the steel is not suitable for popularization and application.
The patent CN 108866431B discloses a steel for high hardenability of engineering machinery and a controlled rolling and controlled cooling preparation method thereof, which have high requirements on production equipment and are difficult to realize.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a preparation method of high-hardenability hot-rolled round steel for engineering machinery.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of high-hardenability hot-rolled round steel for engineering machinery is characterized by comprising the following steps:
the steel-making process comprises the following steps: desulfurized molten iron, converter, external refining, VD vacuum treatment, continuous casting and slow cooling of a slow cooling pit; wherein:
smelting in a combined blown converter, adopting double-slag operation, and controlling the alkalinity of final slag according to 3.5;
LF ladle refining, wherein argon blowing operation is carried out in the whole refining process;
VD deep vacuum time is more than or equal to 13 min;
feeding 200 m of iron-calcium wire after VD vacuum treatment is finished, and ensuring that soft blowing Ar is ensured to be more than 12min after wire feeding;
the superheat degree of continuous casting is less than or equal to 25 ℃;
the casting machine has a casting speed of less than or equal to 0.62 m/min.
The steel rolling process comprises the following steps: heating a casting blank, removing phosphorus by high-pressure water, carrying out phi 850 cogging mill, carrying out phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit rolling, sawing, annealing pit annealing, checking, polishing, bundling, warehousing and delivering; wherein:
the initial rolling temperature is less than or equal to 1050 ℃;
the finishing temperature is less than or equal to 850 ℃;
the temperature of the entering slow cooling pit is more than or equal to 450 ℃;
the temperature of the cooling pit is less than or equal to 150 ℃.
The heat treatment process comprises the following steps: normalizing at a temperature of 910 ℃; the quenching temperature is 895 ℃.
Further, the hot-rolled round steel comprises the following chemical components in percentage by mass: c: 0.39-0.43%, Si: 0.23-0.33%, Mn: 1.68-1.78%, P is less than or equal to 0.025, S is less than or equal to 0.020, Cr: 0.12 to 0.17 percent of the total weight of the alloy, and the balance of Fe and other trace impurity elements.
The effects of some elements in the steel of the invention are as follows:
c: as the carbon content increases, the hardenability and hardenability of the steel increase, but the toughness and weldability of the steel decrease. By applying the technology of the invention, the upper limit of the carbon content is between 0.39% and 0.43% under the condition of not influencing the hardenability of the steel.
Mn: solid solution strengthening elements and right shift of the C curve, thereby obviously improving the hardenability of the steel. Manganese increases toughness and strength of steel, but too high manganese causes segregation. By the technology of the invention, the manganese content is between 1.68% and 1.78%.
Cr: cr can improve the strength, hardness and atmospheric corrosion resistance of steel, and has obvious effect when other alloy elements are added. Chromium slows down the decomposition speed of austenite, remarkably improves the hardenability of steel, has a secondary hardening effect, and increases the temper brittleness tendency of steel. However, if the chromium content is too high, the toughness of the base material and the heat affected zone may be reduced. The Cr element content of the material is designed as Cr: 0.12 to 0.17 percent.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention can effectively improve the hardenability of steel for engineering machinery, homogenize the structure and improve the mechanical property of steel through reasonable chemical component design and production process.
Detailed Description
The present invention is further illustrated by the following specific examples, which are provided for illustrative purposes only and are not to be construed as limiting the scope of the present invention.
The invention is further described below:
table 1 is a table listing the chemical components and weight percent content of each example of the invention;
table 2 shows the specific production process parameters of examples 1 and 2;
table 3 is a table of mechanical property test results of the embodiments of the present invention.
TABLE 1 chemical composition and weight percentage of the examples
| Examples | C | Si | Mn | P | S | Cr |
| 1 | 0.40 | 0.27 | 1.71 | 0.018 | 0.010 | 0.14 |
| 2 | 0.40 | 0.26 | 1.68 | 0.020 | 0.011 | 0.16 |
Table 2 production process parameters for examples 1 and 2
TABLE 3 mechanical Property test results List of the various embodiments of the present invention
The above detection data can show that: the method can be realized by the technological parameters and the component range of the invention. The yield strength, tensile strength, elongation and hardenability of the steel product of the embodiment of the invention all meet the performance requirements.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (2)
1. A preparation method of high-hardenability hot-rolled round steel for engineering machinery is characterized by comprising the following steps:
the steel-making process comprises the following steps: desulfurized molten iron, converter, external refining, VD vacuum treatment, continuous casting and slow cooling of a slow cooling pit; wherein:
smelting in a combined blown converter, adopting double-slag operation, and controlling the alkalinity of final slag according to 3.5;
LF ladle refining, wherein argon blowing operation is carried out in the whole refining process;
VD deep vacuum time is more than or equal to 13 min;
feeding 200 m of iron-calcium wire after VD vacuum treatment is finished, and ensuring that soft blowing Ar is ensured to be more than 12min after wire feeding;
the superheat degree of continuous casting is less than or equal to 25 ℃;
the casting machine has a casting speed of less than or equal to 0.62 m/min;
the steel rolling process comprises the following steps: heating a casting blank, removing phosphorus by high-pressure water, carrying out phi 850 cogging mill, carrying out phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit rolling, sawing, annealing pit annealing, checking, polishing, bundling, warehousing and delivering; wherein:
the initial rolling temperature is less than or equal to 1050 ℃;
the finishing temperature is less than or equal to 850 ℃;
the temperature of the entering slow cooling pit is more than or equal to 450 ℃;
the temperature of the slow cooling pit is less than or equal to 150 ℃;
the heat treatment process comprises the following steps: normalizing at a temperature of 910 ℃; the quenching temperature is 895 ℃.
2. The preparation method of the high-hardenability hot-rolled round steel for engineering machinery according to claim 1, characterized by comprising the following steps: the hot-rolled round steel comprises the following chemical components in percentage by mass: c: 0.39-0.43%, Si: 0.23-0.33%, Mn: 1.68-1.78%, P is less than or equal to 0.025, S is less than or equal to 0.020, Cr: 0.12 to 0.17 percent of the total weight of the alloy, and the balance of Fe and other trace impurity elements.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110775839.2A CN113652604B (en) | 2021-07-09 | 2021-07-09 | Preparation method of high-hardenability hot-rolled round steel for engineering machinery |
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| CN202110775839.2A CN113652604B (en) | 2021-07-09 | 2021-07-09 | Preparation method of high-hardenability hot-rolled round steel for engineering machinery |
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| CN113652604A true CN113652604A (en) | 2021-11-16 |
| CN113652604B CN113652604B (en) | 2022-06-21 |
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Citations (14)
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2021
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